Really Simple Syndication (RSS) is a XML file format designed to display news from particular Web sites without having to visit the site. You can receive news from any RSS-enabled Web site by subscribing to their RSS feed.
Typically, the feeds are displayed as a series of headlines and brief summaries with links to the source of the full text. Many Web sites offer several RSS feeds for specific sections or channels of their site.
RSS on Wikipedia http://en.wikipedia.org/wiki/RSS_(file_format)
Podcasts on Wikipedia http://en.wikipedia.org/wiki/Podcasting